Fig. 2.
Effects of early postnatal alcohol exposure on the circadian period (τ) of rat rhythm in wheel-running activity. (A) Representative activity records of three adult male rats from the SC, GC, and EtOH groups that were maintained under free-running conditions in DD. Actograms are double-plotted over a 48-hr period, and determinations of circadian period by χ2 periodogram and fast Fourier transform are indicated at the bottom of each record. (B) The circadian period of the activity rhythm in the EtOH group (n = 8) was significantly shorter (*p < 0.05) than that found in SC and GC animals (@ n = 8). Bars represent the mean (±SEM) circadian period (τ) of the activity rhythm in hours.